Bug 1491224 (CVE-2017-12154) - CVE-2017-12154 Kernel: kvm: nVMX: L2 guest could access hardware(L0) CR8 register
Summary: CVE-2017-12154 Kernel: kvm: nVMX: L2 guest could access hardware(L0) CR8 regi...
Status: NEW
Alias: CVE-2017-12154
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
(Show other bugs)
Version: unspecified
Hardware: All Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard: impact=important,public=20170912,repo...
Keywords: Security
Depends On: 1491225 1491231 1491232 1491233
Blocks: 1488027
TreeView+ depends on / blocked
 
Reported: 2017-09-13 11:11 UTC by Prasad J Pandit
Modified: 2018-08-28 22:21 UTC (History)
44 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Linux kernel built with the KVM visualization support (CONFIG_KVM), with nested visualization (nVMX) feature enabled (nested=1), is vulnerable to a crash due to disabled external interrupts. As L2 guest could access (r/w) hardware CR8 register of the host(L0). In a nested visualization setup, L2 guest user could use this flaw to potentially crash the host(L0) resulting in DoS.
Story Points: ---
Clone Of:
Environment:
Last Closed:
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
CRM:
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---


Attachments (Terms of Use)


External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:0676 None None None 2018-04-10 08:07 UTC
Red Hat Product Errata RHSA-2018:1062 None None None 2018-04-10 09:31 UTC

Description Prasad J Pandit 2017-09-13 11:11:28 UTC
Linux kernel built with the KVM virtualisation support(CONFIG_KVM),
with nested virtualisation(nVMX) feature enabled(nested=1), is vulnerable
to a crash due to disabled external interrupts. As L2 guest could access(r/w)
hardware CR8 register of the host(L0).

In a nested virtualisation setup, L2 guest user could use this flaw
to potentially crash the host(L0) resulting in DoS.

Upstream patch
--------------
   -> https://git.kernel.org/linus/51aa68e7d57e3217192d88ce90fd5b8ef29ec94f

Reference:
----------
   -> http://www.openwall.com/lists/oss-security/2017/09/26/3

Comment 1 Prasad J Pandit 2017-09-13 11:12:54 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1491225]

Comment 2 Prasad J Pandit 2017-09-13 11:24:55 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1491231]

Comment 4 Prasad J Pandit 2017-09-13 11:49:31 UTC
Statement:

This issue does not affect the versions of the kernel package as shipped with
Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2.

Comment 5 Prasad J Pandit 2017-09-13 19:09:29 UTC
Acknowledgments:

Name: Jim Mattson (Google.com)

Comment 7 Justin M. Forbes 2018-01-29 16:34:34 UTC
This was fixed for Fedora with the 4.13.5 stable updates

Comment 8 errata-xmlrpc 2018-04-10 08:07:04 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:0676 https://access.redhat.com/errata/RHSA-2018:0676

Comment 9 errata-xmlrpc 2018-04-10 09:30:41 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:1062 https://access.redhat.com/errata/RHSA-2018:1062


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